Frictional Afterslip Following the 2005 Nias-Simeulue Earthquake, Sumatra
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- 30 June 2006
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 312 (5782), 1921-1926
- https://doi.org/10.1126/science.1126960
Abstract
Continuously recording Global Positioning System stations near the 28 March 2005 rupture of the Sunda megathrust [moment magnitude ( M w ) 8.7] show that the earthquake triggered aseismic frictional afterslip on the subduction megathrust, with a major fraction of this slip in the up-dip direction from the main rupture. Eleven months after the main shock, afterslip continues at rates several times the average interseismic rate, resulting in deformation equivalent to at least a M w 8.2 earthquake. In general, along-strike variations in frictional behavior appear to persist over multiple earthquake cycles. Aftershocks cluster along the boundary between the region of coseismic slip and the up-dip creeping zone. We observe that the cumulative number of aftershocks increases linearly with postseismic displacements; this finding suggests that the temporal evolution of aftershocks is governed by afterslip.Keywords
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